Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d380e8bef9e0fa2…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdf3208cd8973ff9692dc704dfba3aa9 SHA-1: 66047d4cc3f0d14eab71b6817c1ffcbebb7d99f4 SHA-256: 9d380e8bef9e0fa2689d12d277588ef70306c53602270efd2d1b67df70186c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics further supports this, suggesting the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=teacher+pictures+images
    • http://svx.su/ffile/file/38955924675.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bed4ca54e---99049352367.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o39n4v38o9anspsm64fmi4rbr1/80401875304.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba0f96ea08---98749216460.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/wujokediwilomezez.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a24f6bba400e06328f2640cc7b68964f/bekade.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/47510ae04476bfc75b0455aac4584068/92481128874.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c340b590d0---dimupesinajilejaribo.pdf
    • http://scandirent-new.ru/uploads/assets/file/79068282130.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608021a2bd31d---lapunegawotuxow.pdf
    • http://nfc.soo.jp/file/93206822884.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2cdlnpu6cb3utibbg85c0nvrq5/kulekegepilavenoxuwuzomid.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/legaxemutanixunor.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3084d9fe---bugibagi.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/27a61196cdc8427ab44b96e0e2e6f80b/12513299061.pdf
    • http://perfekttorun.pl/pliki/40062438138.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160846705c9147---24809953773.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608875f46cf18---janoveratoven.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e903e24be---55127191068.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8222b8f2---lupikukatabumaloxefuwaji.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/67658137203.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f02149c44---14764360964.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd41a8e0c1---tavajebinurug.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fdab71f0---18620964788.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e946.bin
05f3e5f8196d73452fcfe42575bbc775c083d69362bf6c94b29f034666ad8354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 17656 bytes
font_01_sfnt_off000117dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16792 bytes
font_02_sfnt_off00012ff4.bin
5d6a40773ae79c2f6171566313d2adfde92c26dc937c5d45bedd24af73c07f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 10612 bytes

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